A Comparative Study on Electrochemical Performance of Single versus Dual Networks in Lithium Metal/Polysulfide-Polyoxide Co-Network/Lithium Titanium Oxide Cathode

IF 5.4 3区材料科学 Q2 CHEMISTRY, PHYSICAL

ACS Applied Energy Materials Pub Date : 2024-05-15 DOI:10.3390/batteries10050163

Hyunsang Lee, Jae-Won Choi, Thein Kyu

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Abstract

The present article introduces a strategy for controlling oxidation and reduction reactions within polymer electrolyte membrane (PEM) networks as a means of enhancing storage capacity through the complexation of dissociated lithium cations with multifunctional groups of the polymer network. Specifically, co-polymer networks based on polysulfide (PS) and polyoxide (PO) precursors, photo-cured in the presence of succinonitrile (SCN) and lithium bis(trifluoro methane sulfonyl imide) (LiTFSI) salt, exhibited ionic conductivity on the order of mid 10−4 S/cm at ambient temperature in the 30/35/35 (weight %) composition. Lithium titanate (LTO, Li4Ti5O12) electrode was chosen as an anode (i.e., a potential source of Li ions) against lithium iron phosphate (LFP, LiFePO4) cathode in conjunction with polysulfide-co-polyoxide dual polyelectrolyte networks to control viscosity for 3D printability on conformal surfaces of drone and aeronautic vehicles. It was found that the PS-co-PO dual network-based polymer electrolyte containing SCN plasticizer and LiTFSI salt exhibited extra storage capacity (i.e., specific capacity of 44 mAh/g) with the overall specific capacity of 170 mAh/g (i.e., for the combined LTO electrode and PEM) initially that stabilized at 153 mAh/g after 50th cycles with a reasonable capacity retention of over 90% and Coulombic efficiency of over 99%. Of particular interest is the observation of the improved electrochemical performance of the polysulfide-co-polyoxide electrolyte dual-network relative to that of the polyoxide electrolyte single-network.

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金属锂/多硫化物-多氧化物共网络/氧化钛锂阴极中单网络与双网络电化学性能的比较研究

本文介绍了一种在聚合物电解质膜（PEM）网络中控制氧化和还原反应的策略，通过离解的锂阳离子与聚合物网络的多功能基团复合来提高存储容量。具体来说，基于聚硫（PS）和聚氧化物（PO）前体的共聚物网络，在琥珀腈（SCN）和双（三氟甲烷磺酰亚胺）锂盐（LiTFSI）存在下进行光固化，在环境温度下以 30/35/35 （重量百分比）的成分显示出 10-4 S/cm 左右的离子电导率。钛酸锂（LTO，Li4Ti5O12）电极被选为阳极（即潜在的锂离子源），与磷酸铁锂（LFP，LiFePO4）阴极结合使用，并与多硫化物-共聚氧乙烯醚双聚电解质网络一起控制粘度，以实现无人机和航空飞行器保形表面的三维打印。研究发现，含有 SCN 增塑剂和 LiTFSI 盐的 PS-co-PO 双网络聚合物电解质显示出额外的存储容量（即比容量为 44 mAh/g），最初的整体比容量为 170 mAh/g（即 LTO 电极和 PEM 的组合），在 50 次循环后稳定在 153 mAh/g，合理的容量保持率超过 90%，库仑效率超过 99%。特别值得注意的是，与聚氧化物电解质单网络相比，聚硫化物-共聚氧化物电解质双网络的电化学性能有所提高。

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来源期刊

ACS Applied Energy Materials Materials Science-Materials Chemistry

CiteScore

10.30

自引率

6.20%

发文量

1368

期刊介绍： ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.